They are investigating the mysterious disappearance of a botanist who specialized in arboreal citrus.
Watson squints, focusing his gaze on something across the gardens. He gasps in surprise and grabs Sherlock's arm. He points at the thing that has captivated his attention and asks "Sherlock, is that a lime tree?"
Sherlock offers a pleasant chuckle and turns to Watson slowly, taking a slow drag from his tar-black pipe. After exhaling the blue-grey smoke into the moist air of the gardens, he says:
It's a lemon tree, my dear Watson.
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